Hi,
When was the last time you changed the Cabin Filter? If it got saturated, this could be the culprit.
Also, there are several Drains for the Car and the AC Unit. Over time, these can become clogged with debris and might not allow rain water to fully drain from the Car, check these - also the Door Drains. Clean them with a piece of wire (bent Coat Hanger will work). Hope this helps...
Happy Motoring!... Jim'99
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